Half to william w



(No Model.)

J. R. J ON BS. DENTAL PLUGGER.

Patented Nov. 12, 1895.

- I/NVENTOH ATTORNEYS.

WITNESSES:

ANDREW BYGRAIIAM PHOTO-LI'I'NQWASNMGI'ON. D C

UNITED STATES FFICE.

PATENT JOSEPH RUSSEL JONES, OF ONTONAGON, MICHIGAN, ASSIGNOR OF ONE-HALF TO WILLIAM W. IVENDELL AND JAMES P. JORDAN, OF SAME PLACE.

DENTAL PLUGGER.

SPECIFICATION forming part of Letters Patent No. 549,872, dated November12, 1895.

, Application filed March 30, 1895.

To all whom it may concern.-

Be it known that I, JOSEPH RUssEL JONES, residing at Ontonagon, in thecounty of Ontonagon and State of Michigan, have invented a new anduseful Improvement inDental Pluggers, of which the following is aspecification.

My invention is an improvement in dental pluggers, and particularly inthe malletingholders, whereby the operator may properly mallet theplugging-instrument in the operation of the improvement; and the presentinvention seeks to provide improvements in the holder-frame, whereby tofit the same to receive and grasp any of the usual forms ofplugging-instruments; also, in the mechanism for supporting andmanipulating the mallet, so that the operation thereof may be easilyeifected and controlled by the operator.

The invention consists in certain novel constructions, combinations, andarrangements of parts, as will be hereinafter described, and pointed outin the claims.

In the drawings, Figure 1 is a side view, and Fig. 2 is a longitudinalsection, of my improved plugger. Fig. 3 is a detail edge view, and Fig.4 shows a somewhat difierent connection between the operating chain orcord and the mallet-shaft.

The frame includes a tube-like holder A, having its upper end open andprovided at such open end with inwardly-extended lugs,

' flanges, or other projections lapping over the upper end of theinstrument and stopping the same from upward movement and leaving thehead of the instrument exposed for the stroke of the mallet. At thelower end of the holder I provide a clamp for gripping the tool, formed,preferably, by slitting the end of the holder at b, which forms aspringclamp, and threading the slitted portion in the main portion so itmay be adjusted. By this construction the instrument may be firmly andpositively secured in the holder in position to receive the stroke ofthe mallet.

Near the upper end of the holder I provide a lateral frame 0, in thenature of a casing, supporting near its outer end the shaft D,supporting the mallet-handle E, and connected with the operating devicesand the retracting-spring, preferably, in the manner $erial No. 543,828.(No model.)

shown. To this end I provide on the shaft D a sprocket-wheel F, overwhich passes a sprocket-chain G, which is connected to a spring H, whichis held adjustably to the frame by means of a bracket or lug I,adjustable in a slot 1' in the frame and held in any suitable adjustmentby a clamp J. This provides for adjusting the tension of the spring fromtime to time, as wear or circumstances may render necessary ordesirable. Between the operating-lever K and the chain G, I provideintermediate devices, consisting, preferably, of the slide rod L,intermediate lever M, and chain or arc lever N, connected by link m withthe lever M, as shown.

The operating-lever is pivoted at k to lugs projecting from a sleeveencircling the holder A, has a set-screwk, bywhich the movement of thelever may be limited, and at its upper end the operating-lever has anarm engaging a bearing L on the lower end of the sliderod L, so thatasthe hand-lever is pressed in against the holder it will pull theslide-rod down, the said slide being guided in keepers alongside theholder A. It is manifestly desirable that a slight movement of theoperating-lever should accomplish a considerable throw of the mallet,not only because of the greater force given the mallet by such movement,but also because bya considerale throw of the hammer a delicacy inmalleting can be accomplished, practically impossible with a limitedmovement of the mallet. In the construction shown the mallet movesthrough an are approximately three-fourths of a circle, so that itsstroke may be administered with great force, and it can be so swung asto deliver a light tapping stroke, the operation being entirely underthe control of the operator.

In securing the long movement of mallet I provide between theoperating-lever and the mallet the lever devices by which to secure theincrease of movement desired, and in the special construction shown theintermediate lever M is pivoted at m, is connected by a link m with theslide-rod L near its pivot m, and is connected by a link m with thelever N near the pivot n of the latter. This lever N has a curvedsurface n, along which the chain extends, and is secured at the lowerend of the curved edge, as shown, thus givingan evenness to the drag onthe chain and tend ing to avoid any abruptness or jerkiness in themovement.

The frame 0 is open at one side and is provided with a cover-plate O forsuch side, which may be secured by a screw 1, as shown.

The operation is simple, pressure on the finger-lever throwing themallet from the fullline position shown in Fig. 1 to the dotted positionshown in said figure, the dotted lines representing the mallet at themoment of deliverin g the blow, when it will strike the plugger andrebound slightly. The blow maybe regulated by the screw-stop for thefinger-lever,which will increase or reduce the rebound, and the lugssupporting the finger-lever form a firm bearing to be grasped by theoperator. The blow given by the mallet is a sharp welding-blow,altogether ditferent from a springblow, as the spring is simply used toretract the mallet, as in my improved plugger the operation and effectare similar to those produeed by the hand'mallet and which requires theuse of both hands or an assistant to do the malleting.

It will be seen that the improved plugger may be used as a hand-pressureinstrument without requiring any changes or adjustments.

Any form of plugging instruments or points may be employed and may befitted in the holder in any desired direction.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is

1. The combination in a dental plugger, of the mallet, the are lever,the connection between said lever and the mallet, the intermediate leverconnected with the arc lever, the finger lever, and connections betweenthe linger lever and the intermediate lever substantially as set forth.

2. In a dental plugger the combination of the mallet, the arc lever, theflexible connection extending over the are surface of the lever andconnecting the latter with the mallet and devices by which to operatethe arc lever substantially as set forth.

3. In adental plugger the combination with the mallet and its shafthaving a sprocket wheel of the chain engaging said wheel, the springconnected with one end of said chain and the operating device connectedwith the other end of the chain, substantially as set forth.

i. The combination in a dental plugger of the holder, the lateral frameat the upper end thereof, the mallet and lever devices supported in saidframe and connected as described, the finger lever and the slide rodengaged by said finger lever and connected with the lever devices of thelateral frame substantiall y as set forth.

5. The in'iproved dental plugger, comprising the holder having openupper end and provided at such end with an inwardly projected stop tolimit the upward movement of the instrument and provided near its lowerend with the clamp, the mallet having its shaft provided with a sprocketwheel, the chain engaging such wheel, a spring connected with one end ofsaid chain, the are lever connected with the other end of the chain, theintermediate lever, the finger lever and the slide rod all substantiallyas and for the purposes set forth.

JOSEPH RUSSEL JONES.

\Vitnesses:

CHAS. II. MATHEWS, W. L. PORTER.

